overexpression
UK[ˌəʊvərɪkˈspreʃən]US[ˌoʊvərɪkˈspreʃən]
n
The production of a gene product (such as a protein) in abnormally large amounts by a cell or organism.
n
The excessive or heightened expression of a quality, emotion, or trait.
Morpheme Breakdown
over
expression
over
excessive
expression
act of expressing
Etymology
The word 'overexpression' is a modern scientific compound formed within English by combining the native Germanic prefix 'over-' with the Latinate noun 'expression'. The prefix 'over-', derived from Proto-Germanic uberi and ultimately from the Proto-Indo-European root uper (over, above), carries its core sense of excess. 'Expression' originates from the Latin exprimere (to press out, represent), from ex- (out) + premere (to press). In genetics, the term logically applies this literal sense of "excessive pressing out" to the cellular process of transcribing and translating a gene into its protein product at an abnormally high rate. Thus, a technical concept is built transparently from familiar morphemes meaning "too much" and "making manifest."
Analysis
Structure: over (excessive) + expression (act of expressing)
- over: From Old English ofer, meaning "above, beyond, excessively." It functions as an intensifying prefix indicating excess.
- expression: From Latin expressio (a pressing out, manifestation), via Old French. It functions as the core noun denoting the act of making something known or producing something.
Examples
The overexpression of the HER2 protein is linked to aggressive forms of breast cancer.
Researchers induced gene overexpression in the model organism to study its function.
His theatrical performance was criticized for its overexpression of grief, lacking subtlety.